Distributed electricity generation voltage regulating and filtering system and method

Abstract

The invention discloses a distributed electricity generation voltage regulating and filtering system and method. The distributed electricity generation voltage regulating and filtering system comprises a signal acquisition module as well as a voltage regulating module and a filtering module which are connected in series to a key node between a load and a power distribution transformer, wherein thesignal acquisition module is used for acquiring bus voltage and current signals between the load and the power distribution transformer and a voltage signal of an additional key node; the voltage regulating module comprises a voltage regulator and at least two transformers provided with embedded voltage sensors inside, and the transformers are controlled to switch by silicon controlled rectifiers; the filtering module comprises a filter and a filtering controller controlling the filter to switch. Through switch of multiple transformers and filters, the purposes of voltage stabilization and filtration are achieved, the regulating capability can be up to 1,000 kVA, the total harmonic distortion of voltage is smaller than 4%, and the system and the method are applicable to single-phase, double-phase and three-phase power models.

Description

technical field [0001] The invention relates to the field of intelligent voltage regulation, in particular to a distributed power generation voltage regulation filter system and method. Background technique [0002] With the increasing problems of global energy shortage and environmental pollution, the total amount of renewable energy power generation has increased significantly. Solar energy is rich in resources and widely distributed, and it is the renewable energy with the most development potential. Solar photovoltaic power generation is clean, safe, convenient, and High efficiency and other characteristics have become an emerging industry that is generally concerned and focused on development by countries all over the world. [0003] However, the access of more and more distributed renewable energy has posed huge challenges to grid management. The most prominent problems include voltage fluctuations and degradation of power quality. Voltage fluctuations include amplitu...

AI Technical Summary

Problems solved by technology

[0005] 1. Extended network: The existing network has poor short-circuit capability, which is not conducive to more cable access

Expanding the network can improve the short-circuit capability, but expanding the network is expensive and not an effective solution to stabilize voltage; in addition, expanding the local network cannot solve the problem of voltage peaks

[0006] 2. Reactive power compensation: This method is very effective for medium-voltage or high-voltage systems, and is more suitable for inductive loads; for low-voltage systems with a considerable proportion of resistive loads, a large amount of reactive power compensation is required, which is expensive

However, the adjustment ability of the current low-voltage adjustment system is relatively low, which is not enough to meet the needs of users.

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